User manual RAYMARINE NMEA MULTIPLEXER

[. . . ] · More than 7 ft (2 m) from the path of a radar beam. A radar beam can normally be assumed to spread 20 degrees above and below the radiating element. · The equipment is supplied from a separate battery from that used for engine start. Voltage drops below 10 V in the power supply to our products, and starter motor transients, can cause the equipment to reset. [. . . ] 4 NMEA in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 NMEA out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 CAUTION: Electrical Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Securing cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Data indicator lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Overflow indicator lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Both indicators lit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 iv 1 Introduction The Raymarine NMEA Multiplexer combines data from up to four NMEA-0183 devices to provide a single, multiplexed NMEA output. Inputs & outputs The NMEA Multiplexer has: · Four NMEA inputs (listener-ports), NMEA In 1, 2, 3 & 4. · One NMEA output (talker-port), NMEA Out · One common terminal NMEA Out Com. NMEA In 1a NMEA In 1b NMEA In 2a NMEA In 2b NMEA In 3a NMEA In 3b NMEA In 4a NMEA In 4b NMEA In Shld NMEA-0183 Multiplexer Data Overflow NMEA Out a NMEA Out b NMEA Out Com NMEA Out Shld Not used PWR +12/24V GND D7684-1 2 NMEA inputs Each NMEA in (listener) port is a differential pair across terminals a and b, and can receive NMEA data from one device. The speed of each listener port is fixed at 4800 baud. NMEA data on listener ports 1 and 2 is multiplexed in real time (i. e. NMEA data on listener ports NMEA In 3 and 4 is fed via a discrete buffer for each port. Each buffer holds approximately 2 seconds of NMEA data. Input priorities Data at the listener ports is prioritized, so that each NMEA in port is read twice as often as the next one. Thus for example, data at input 1 is read in twice as often as data at input 2, four times as often as input 3 and eight times more often than input 4. NMEA outputs The NMEA Out (talker) port is a differential pair across terminals a and b, and feeds multiplexed NMEA data from all the NMEA inputs, to up to four products. 3 Installation Mounting As the NMEA Multiplexer is not waterproof, it must be fitted in a location where it will not come into contact with water. Secure the NMEA Multiplexer to a suitable surface, as shown in the following illustration. 1. Place the NMEA Multiplexer at the intended location and mark holes for fixing screws. Drill two 1/8"(3. 4 mm) pilot holes for NMEA Multiplexer screws. Da ta Ov erflo w NM EA -01 83 Mu ltip lex er 3. [. . . ] that more data is coming in than can be transmitted. When a buffer is full, 8 partially received sentences will be discarded, to ensure that the NMEA Multiplexer only passes complete and valid sentences. You may be able to resolve this overflow situation if you: · Set up the devices on the listener ports to send less data or data at greater intervals. If possible, disable non-relevant sentences. [. . . ]